You can fix “the proxy server is refusing connections” error in Mozilla Firefox in Windows 10 by these two simple methods.
Method #1: 0m4s
Right click on windows start buttoncontrol panelnetwork and internetinternet optionsConnectionsLAN Settings.
Check to enable “Automatically Detect settings”.
UNCHECK all other options.
Method #2: 0m47s
Open Mozilla FirefoxSettingsOptionsAdvancedNetworkSettingsSelect Auto Detect Proxy settings for this network!
Done! Reconnect to your wifi/internet connection and it should be working properly!